/*
 * Copyright (C) 2005-2011 MaNGOS <http://www.getmangos.com/>
 *
 * Copyright (C) 2008-2011 Trinity <http://www.trinitycore.org/>
 *
 * Copyright (C) 2010-2011 ProjectSkyfire <http://www.projectskyfire.org/>
 * 
 * Copyright (C) 2011 ArkCORE <http://www.arkania.net/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef ARKCORE_TIMER_H
#define ARKCORE_TIMER_H

#include "ace/OS_NS_sys_time.h"
#include "Common.h"

inline uint32 getMSTime() {
	static const ACE_Time_Value ApplicationStartTime = ACE_OS::gettimeofday();
	return (ACE_OS::gettimeofday() - ApplicationStartTime).msec();
}

inline uint32 getMSTimeDiff(uint32 oldMSTime, uint32 newMSTime) {
	// getMSTime() have limited data range and this is case when it overflow in this tick
	if (oldMSTime > newMSTime)
		return (0xFFFFFFFF - oldMSTime) + newMSTime;
	else
		return newMSTime - oldMSTime;
}

inline uint32 GetMSTimeDiffToNow(uint32 oldMSTime) {
	return getMSTimeDiff(oldMSTime, getMSTime());
}

struct IntervalTimer {
public:

	IntervalTimer() :
			_interval(0), _current(0) {
	}

	void Update(time_t diff) {
		_current += diff;
		if (_current < 0)
			_current = 0;
	}

	bool Passed() {
		return _current >= _interval;
	}

	void Reset() {
		if (_current >= _interval)
			_current -= _interval;
	}

	void SetCurrent(time_t current) {
		_current = current;
	}

	void SetInterval(time_t interval) {
		_interval = interval;
	}

	time_t GetInterval() const {
		return _interval;
	}

	time_t GetCurrent() const {
		return _current;
	}

private:

	time_t _interval;
	time_t _current;
};

struct TimeTracker {
public:

	TimeTracker(time_t expiry) :
			i_expiryTime(expiry) {
	}

	void Update(time_t diff) {
		i_expiryTime -= diff;
	}

	bool Passed() const {
		return i_expiryTime <= 0;
	}

	void Reset(time_t interval) {
		i_expiryTime = interval;
	}

	time_t GetExpiry() const {
		return i_expiryTime;
	}

private:

	time_t i_expiryTime;
};

struct TimeTrackerSmall {
public:

	TimeTrackerSmall(uint32 expiry) :
			i_expiryTime(expiry) {
	}

	void Update(int32 diff) {
		i_expiryTime -= diff;
	}

	bool Passed() const {
		return i_expiryTime <= 0;
	}

	void Reset(uint32 interval) {
		i_expiryTime = interval;
	}

	int32 GetExpiry() const {
		return i_expiryTime;
	}

private:

	int32 i_expiryTime;
};

struct PeriodicTimer {
public:

	PeriodicTimer(int32 period, int32 start_time) :
			i_period(period), i_expireTime(start_time) {
	}

	bool Update(const uint32 &diff) {
		if ((i_expireTime -= diff) > 0)
			return false;

		i_expireTime += i_period > int32(diff) ? i_period : diff;
		return true;
	}

	void SetPeriodic(int32 period, int32 start_time) {
		i_expireTime = start_time;
		i_period = period;
	}

	// Tracker interface
	void TUpdate(int32 diff) {
		i_expireTime -= diff;
	}
	bool TPassed() const {
		return i_expireTime <= 0;
	}
	void TReset(int32 diff, int32 period) {
		i_expireTime += period > diff ? period : diff;
	}

private:

	int32 i_period;
	int32 i_expireTime;
};

#endif
